Why did I almost pass out in the shower and couldn't move my left arm?

I woke up around 8am as usual, had breakfast and took a shower. When I was about to finish showering myself I started feeling really dizzy, the water wasn't too hot but I decided to bend my head down and before leaving the shower I rinsed myself with tepid water. I sat for a few minutes with my head down but it took sometime to recover. Every time I tried to stand I started feeling weak and dizzy again and on the verge of passing out. I was also struggling to wrap myself in a towel because I couldn't move my left arm it was completely numb and I have no clue what this means. After around ten minutes I started feeling better and could finally continue with my daily routine. What scared me was the fact that I couldn't move my left arm for a while.
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20 d
I didn't feel any pain or pressure on my chest.
Why did I almost pass out in the shower and couldn't move my left arm?
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